Building-block.



PATENTBD NOV. 26, 1907.

W. L. DOW. BUILDING BLOCK. APPLIOATION FILED 1111.25, 190s. nBNnwBD SEPT. 12, 1907.

ll//TMEJSES UNITED- sTATEs PATENT oEEioE.

WALLACE L. DOW, OF SIOUX FALLS,`SOUTH DAKOTA.

BUILDING-BLOCK.

Speciication of Letters Patent.

Patented Nov. 26, 1907.

application mea Jmm'y 25. 190e. se=ia11i0.297.773. Renewed septemte, 12.1907.l serai No. 392.572.

To all/whom 'it may concern:

Be it known that I, WALLACE L. Dow, of Sioux Falls, Minnehaha county, South Da kota, have invented certain new and useful `Improvements in Building-Blocks, of which block when it is molded, thereby facilitating the manufacture of the block and avoiding the necessity of inserting the brid means into themold each time a blockgormed.

The invention consists, generally, in providing a bridginplate adapted to bond the ends of two b oc sections to ether and put in place during the erection o the wall. n lthe accom anying drawing forming part of this speci cation, Figure 1 is a vertical sectional view of a wall illustrating the position of the bridging plate therein. Fig. 2 is a sectional view on the line :v -a; of Fig. 1. Fig. 3 is a perspective view of the plate separated from the block. f

In the drawing, I have shown each block composed of two rectangular sections 2 corres ondi tonne another in size and shape,

` an ca ab e of being molded separately and assemb ed when the wall is to be built, any

. suitable width of air space beinmgrovided to the erected. It has b ocks are formed between the block sections accor :character of the wall being been customary, where with a dead air space between their inner and outer walls tomold the two sections simultaneously land connect them by a suitable bridging means which is embedded at the ends in the block sections, thus t or bon them together. Ihave found, owever, t t `there are several ob'ections to a block made in this Way. A arger and more expensive mold is re uired, more time is consumed in forming the locks and bondi the sections together, and it is more dith- -c t, particular] in the manufacture of large blocks,\to han e them where an air space is formed between the sections in the mold and the brid means has its ends embedded in the sections; furthermore, the width of the ma be molded separately and provided with soc ets 3 arran ed one above another in the ends of the sections.

The blocks are assembled when it is desired to build .the wall, and an air space of suitable Width provided between the inner and outer portions, such space varying in width according to the thickness of the wall and the climate where the building is being built. As each course of blocks is laid I provide plates 4, preferably of cast metal,

aving a series of pins or lugs 5 on each side thereof, adapted to slip into the sockets 3 in the ends of the abutting blocks, the plate intermedia-te to the `ins corresponding substantially to the wi thof the ]oint and thc usual iillinr material, such as mortar or cement, bein flled in around the edges of the plate 1n the usual way. The plate 4 will bridge the air space between the bloc-k sections and hold the said sections in roper alinement and form a rigid substantia bond' between the inner and outer surfaces of the wall and the diagonal arrangement of the lugs will prevent laterally twisting or racking of the wall.

, I claim as my invention:

A Wall com os'ed of artificial blocks, each block comprising two sections or parts having a vertical 4air space between them and each section having sockets in its ends extending lengthwise thereof, and a plate arranged vertically in the joint between the ends of abutting blocks and having corner lugs projecting outwardl on each si e of the plate in a direction su stantially at right angles to the plane of the plate and fitting within said sockets and said lugs being diagonally arranged on said plate whereby they will brace and stifen the wall and prevent lateral twisting and racking of the saine.

In Witness whereof, I have hereunto set my hand this 20th day of January 1906.

. WALLACE L. DOW.

Witnesses RICHARD PAUL, C. MACNAMARA. 

